Question about Microwave Ovens

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Microwave has a short if you tap it then it comes on for a sec then lights go out again. We opened it up but can not see any loose connections. It did however come on and stay on when last screw was taken out but as soon as husband moved it of course it went off.

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  • roberta3fan May 11, 2010

    Have you had the cabinet apart for another problem before this one? If so it could be that all the screws weren't the same length and it's in the wrong spot.

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  • Microwave Ovens Master
  • 1,922 Answers

Sounds like your safety door interlock microswitch is mis-adjusted,it is made to blow the fuse if you open the door during operation,if they get loose or mis-adjusted this will happen

Posted on Oct 05, 2009

  • daniel  hendrickson
    daniel hendrickson Oct 05, 2009

    sounds like your safety door interlock microswitch is mis-adjusted,it is made to blow the fuse if you open the door during operation,if they get loose or mis-adjusted this will happen

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Microwave us unresponsive, no display & no light. At one point when I opened the door it came back to life but died again shortly after


This means that more than likely something is loose or the capacitor on the power supply has failed. You will have to take it down and take it apart. I don't ever recommend that because technically you must check it for microwave leakage if you take it apart. Most people don't have that equipment.

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Troubleshooting your Panasonic microwave oven requires removal of the cover. There may be a loose or broken connection inside. Be sure to read and heed the dangerous voltage warning. As for the repair or replace issue, that depends on age (in appliance years) and whether parts cost and labor are reasonable.

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Microwave power turns off after a few sec running incl oven power


I would suggest having whoever installed the new appliances come back and check out his work. There might be a poorly made electrical connection somewhere, and you might have a potential fire hazard.

You might also have gotten a lemon microwave oven. This happens sometimes. (Usually when I buy something.) Contact the store where you purchased it and ask if they have a service person who can check it, or just tell them what's happening and you want a replacement. They'll just return yours to the manufacturer.

In any case, have this checked out to be sure your wiring isn't at fault.

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well an educated guess would be a short or loose connection in a common thats shared between the two that could rattle loose when it so chooses.. without a wiring diagram it would be hard to guess more specifically where without laying hands upon it.. and for that you'd have to lower it to the countertop level and dismantle to test.. it could always turn out to be a bad board also, but thats usually a done deal and doesn't repair itself then break again..
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open the oven there are two or three safty switches near door one of the switch is for light if it is short then only light will remain on.by opening door light should come on set the time and hit start light will come again. replace that switch and it will be ok

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Is it still under warranty? If so, take advantage of it. If you are on your own, does it have power (light comes ON when door opened)? Open the case, (power plug out) and look for a blown fuse. The fuse will pop when there is trouble in the HV system for the magnetron--usually a shorted HV diode or shorted stirrer fan bearing which is located within the waveguide that is located just over the cooking cavity. If the fuse is good, check the door interlock switch near the door latch mechanism. It may be a faulty micro-switch, loose switch, or damaged actuator.

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Loose connectors can cause charring, and eventually open up the connection.

It would help to have your full model number and FCC ID number, and a clear photo or two of the trouble area so I can guide you.

For more free DIY and other help & advice, feel free to contact me via my site.

William E. Miller, AS-EET
http://www.microwavecontrol.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"

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The problem is most likely a burnt, loose, or cold solder connection on the control board. Most likely at the low-voltage transformer that supplies power the board itself. Carefully resoldering any suspect connections in this area should solve the problem. Be careful not to get too much solder on the connections that could short one to another.

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Kitchenaid ykcms135h intermittent problem.


if you are not a tech kindly take your microwave to a tech for repairs.the diodes or the cap high voltage is your culprit.good luck.

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